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Figures (4)

Fig. 1 JAWS filter. (a) Schematic. The dispersed light with spatially overlapped degenerate FSRs interferes in the Fourier plane at the intensity mask. The returned light exhibits a periodic sawtooth spectral pattern. (b) Simulation of the mapping relation between the wavelength and diffraction angle. (c) Simulation of the filter response: when the area of x < 0 is masked (top) and when the area of x > 0 is masked (bottom).

Fig. 2 Experimental demonstration of the JAWS filter. The period of the sawtooth spectrum (i.e., the FSR) can easily be varied by changing the thickness of the VIPA, depending on the requirements for various applications. The slight nonlinearity in the sawtooth pattern comes mainly from the finite length of the VIPA due to which a small portion of the resonant light leaks out of the top end of the VIPA and can be suppressed by the use of a longer VIPA.

Fig. 3 Application of the JAWS filter to a FBG sensor array. (a) Experimental apparatus. Strain-induced wavelength shifts in the reflections from the FBGs are converted by the JAWS filter into intensity changes. (b) Pulses detected by the photodiode with and without strain on the FBGs, indicating that the applied strain is converted to the intensity change in each pulse. (c) Corresponding spectra of the pulses reflected by the FBGs measured by an optical spectrum analyzer, showing that the intensity change agrees with the wavelength shift for each pulse. (d) Relation between intensity change and strain on each FBG, indicating that all the FBGs have linear relations.

Fig. 4 Application of the JAWS filter to ultrahigh-frequency sawtooth waveform generation. (a) Experimental apparatus. The spectrum filtered by the JAWS filter is mapped into the time domain by GVD in the dispersive fiber. (b) Sawtooth waveform produced by the sawtooth generator and measured by an oscilloscope with 16 GHz bandwidth and 50 GS/s sampling rate. The fundamental frequency of the sawtooth waveform is 1.52 GHz.